European Photovoltaic Solar Energy Conference and Exhibition (27 : 2012 : Frankfurt am Main) Proceedings München : WIP Renewable Energies, 2012 (2012), Seite 2300-2304 1 DVD-ROM
National Academy of Sciences (Washington, DC) Proceedings of the National Academy of Sciences of the United States of America Washington, DC : NAS, 1877 108(2011), 20 vom: 17. Mai, Seite 8420-8425